Grinding machine



arch 29 1927 E. F. MAAS INDING MACHINE Filed April 14, 1922 3 Sheets-Sheet 2 S14/newton Elev F, M0237.

@13 Clifton/mugs 1,622, 27 March 291927. E F MAAS 5 GRINDING MACHINE Filed April 14, 1922 5 Sheets-Sheet l n vwefntoz Eloy F'Mi. @15 gt4/5 SHOM/mgl.

mmv/@g 1,622,527 March 29, 1927. E. F' M A As GRINDING MACHINE Filed Apri114, 1922 v 3 sheets-sheet Z A I I wuentoz Elm/ F Maag.

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Patented 'Meeza 1927'.

PATENT. OFFICE.

ELOV F. EIMS, OF LONG BRANCH, NEW JERSEY.

GBJNDING MACHINE.

appiieapienmea april 14, i922. seriei No. 552,552.

The object of this invention sto provide a grinding machine capable of 'producing automatically an ellipsoidal surface upon an article, ther-machine being particularly` designed for the production of ellipsoidal` surfaces u'pon the rolling elements for use in disc roller bearings.

One form of machine constructed and operating in accordance with the preent in-- vention will be fully described and the distinctive features of the machine will appear clearly from this description and will be pointedk out iii the claims appended hereto.

This form of machine is illustrated in the accompanying drawings, in which:

Figure 1 is a vertical 'sectional View of the machine, the section beinof takenV along a plane including the axes of the 'grinding wheels and rolling element being ground; Figure 2 isa vertical :cctional view of the machine, thef plane of the section being at right angles to that of'Figure 1 and including the grinding wheels andjrolling element being "ground ,l

-Figure 3 is a plan' view ofthe machine shown in Figures l and 2.and

representing lution of the roller A .isv

Figure 4 is a diagram showing a -form of rolling element capable of being ground by the machine illustrated in the preceding iigures. y

A rolling element or roller adapted to be groundA by the present machine is indicated by the heavy lines in 'Figure 4. The figure is bounded'by two parallel straight lines representing the fiat side faces of the roller andby two arcs a-b, arepresenting the peripheral surface of-the roller. These arcs form parts of circles having radii -rand r.

respectively and centers .c and c'- respec-V tively, which are spaced apart as indicated.

The' peripheral generated by the rotation of the circular arca-b not about its 'center c 't about anaxis. d-e which is midway between the centers c-c and is parallel to a straightline joining ythe points a and b. The peripheral surface ofy the Lroller is thus not spherical but ellipsoidal.

'This kind of. roller has th'reefdetermining dimensions, namely, the/diameter D, the

' width Band the distance Cbetween the centers-of curvature c and c. It will be seen Hektik-radius r er r is fixed 'Whse the the roller and indicated at A4 Surface orsurface of revodiameter and the distance C are given, the radius being equal to one-half of,the sum of D and C.

` The grinding machine accordingto the present invention is designed to have adjustments to enable it to operate upon rollers or like articles having different diameters,

widths and distances between the centers of.

all of the parts ofthe machine in proper operative relation. At opposite sides of the machine framework'h Figure .1, are integrally or otherwise formed guide supports or webs 2 which, as shown more clearly in Figure 2,' extendacross tlie space between upstanding portions 3 of the framework, be-V tween which upstanding portions moves the lower wheel carriage hereinafter referred to. Supported upon and suspended from the guide supports or webs 2 are the upper and lower circular guides 4 and 5 respectively, these guides being secured to the webs 2 by means of the bolts 6 passing through the anges ,7 of the guides and through the webs 2. Each guide, a3 clearly shown in Figures 2 and 3, comprises two 'spaced guide vmembers connected rigidly together by integral webs 8, such webs being spaced apart sufficiently to allow of the required movement of the wheel carriages upon the guides 4 and 5 during the grinding operation.

and 10, the wheel carriage, being substan.

tially Similar in form, although differing slightly in detailed construction, as will be later pointed out.

The iipper Wheel carriagevomprises va hollow body member 11 fitted between the spaced-members 4-4 of the upper circular guide and having laterally projecting por-v tions 12 at its lower portion, the upper. sur- 'faces of which are curved to contact with.

the lower surfaces of the guide members 4. ,At its-upper part the body 11 of the wheel carriage,has secured thereto, as by-means of' studs 13,' two bearing members or strips 14, the lower surfaces of which are' curved to contact'with the upper curved surfaces of the guide` members 4. B y this arrangement osg support the Wheel shaft supporting spindles l '17, later referred to;

1n order to accurately adjust the bearing members 14 to enable the wheel carriage to move freely upon its circular guide 4, and in case of wear, these bearing members may be adjusted toward the guide members 4 by means `of square ended studs. 18 carried by the topplate 15 andY engaging the upper sides of the bearing members, these studs being provided with 'suitable locking nuts as indicated. It will be understood that the apertures inthe bearing members 14 for the studs 13 are such as to permit of this adjustment.

.lie wheel shaft supporting spindles 17 are formed intermediate their ends with apertures in bosses 20 at the lower part of trie carriage body to prevent rotation of said.

spindles, and they are provided at their lower ends with heads 21 in which the wheel shaft 22 is supported. This shaft 22 has mounted thereon a grinding wheel 23 of suitable diameter and thickness, the wheel being firmly clamped and held between a disc 24 and a driving pulley 25 at opposite sides of.

the wheel, the pulley being suitably keyed to the wheel shaft. The driving pulley 25 has extending axially from one side thereof a sleeve'portion 26 which is mounted in the `lhead 21 of one of the spindles 17 and the Wheel shaft is provided at one end with a head 27 and with an intermediate shoulder 28 engaging the disc 24, the shaft being threaded atits other end and having thereon nuts 29. With. this construction when the nuts 2)V are tightened on the wheel shaft the Wheel 23 is firmly clan'iped between the disc 24 and pulley 25 and is thereby rotated with the pulley and shaft. By removing the nuts 29 the shaft 22 may be withdrawn, thereby enabling the wheel 23 to be removed and replaced while leaving the driving pulley v25 in place wit-h its sleeve portion 26 bearing inthe head 21. f

The supporting spindles 17 at their upper ends pass freely through the topplate 15 and are provided' at.said ends with screw threads upon which are threaded nuts.30. These nuts attheir lower sides bear against `the upper side of the top plate 15 and thus support the spindles 17 and thefwheel shaft carried thereby. If desired, suitable antifriction discs or other devices 31 may be interposed between the nuts 30 and the top plate 15. `It will be seen that by rotation of the nutSO on the threaded portions of' the spindles 17 in one direction Ourthe reverse, the spindles, which are-held against Yrotation, may be raised or lowered to correspondingly raise or lower the grinding wheel shaft to thereby adjust t-lie grinding wheel so that it may operate upon rollers 0rthe like o f different diameters.

Mechanism maybe provided for eecting a fine adjustment of the spindles 17in addit-ion to the coarse adjustment provided by the nuts 30 on the threaded portions of the spindles. This mechanism comprises a -worni or screw 32 supported in bearings 33 on the top plate 15, the nuts 30 beingprovid'ed with teeth to engage opposite sides of this screw.

On the projecting end of the screw spindle is molmtcd a ratchet 34 adapted at the limit of movement of the wheel carriage in one di- .rection to be. engaged by a pawl 34. Thisl pawl is pivotally mounted on one of two supporting plates 35 which are bolted to alug 36 projecting from one of the guide members 4, the pawl being movable from an inoperative position indicated in full lines in F igure 1, to an operative position indicated in dotted lines, in which it rests on the upper end of the other plate 35 in such position as to engage the'i'atchet 34 and advance the same through a single tooth space. llhcii the ratchet is thus turned it rotates the screw 32 and thereby the nuts 30 are rotated so as to lower tliesupporting spindles 17. By this means the grinding Wheel may be adjusted to take up Wear therein.

A s abovestated, the lower wheel carriage is similar in construction to the upper wheel carriage, excepting, of course, that it occupies .a reverse Vposition on the circular guide 5, the wheel shaft being cari'ied at the upper ends of the supporting spindles 17. The detailed construction of the supporting spindles 17 and of the wheel'shatt, wheel, and driving pulley therefor, are the same as described with reference to the upper wheel carriage, similar reference letters being applied to these parts.

lt will be noted that the adjusting nuts 30 are on the lower threaded portions of the spindles 17 and the lower plate or member 37 corresponding to the top plate 15 of the upper wheel carriage, is providedwith a portion 38 lying beneath the nuts 3() and upon which the nuts aie supported, prcfer ably by means of friction discs or other devices, whereby the spindles 17 and wheel shaft carried thereby are properly supported and are adapted to be raised or .lowered by rotating the nuts 30 in one direction or the reverse. It .will be understood that the threaded portions of the supporting inembers extend freely through the part 38 of the lower plate 37 i The Worm or screw 32 of the lower wheel carriage is adapted to be actuated at the limit 0f movement in one direction of said carriage by the pawl 34 pivoted on one of the supporting plates 35, as described with reference to' the upper i)vlleel carriage, the lower supporting plate, however, being bolted to a projection 39 on the framework 1 of the machine. i

The bearing members 14 of the lower wheel carriage arecurved to engage the lower parts of the guide members 5 and preferably upper bearing strips 40 are provided between the upper surfaces of the guide members-5 and the projecting portions 12 of the lower carriage body.

The wheel carriages 9 and 10 are given a slow reciprocating motion over the circular guides 4 and 5 by the mechanism which is illustrated in Figures 1 and 3. This mechanism comprises a shaft 41 mounted in bearings 42 on a bracket member 43 which is secured to the machine framework 1 as illustratedclearly in Figure 1, and in a bearing 44 on albracket-45 also secured to said framework. This shaft 41 is provided at its outer end with a pulley 46 connected by a belt 47 with a suitable overhead countershaft and is provided' at its inner end with a pinion 48,

53 thereon. The crank pins 53 of the upper pair of discs 52 are connected to the outer ends of connecting rods 54,' the inner ends of which are connected to pins projecting from opposite sides of the carriage body 11 of the upper wheel carriage 9. Simllarly the crank pins 53 of the lower pair of crank discs 52 are connected by the connecting rods 54 to laterally projecting pins 55 on the carriage body 11 of the lower wheel carriage 10. It will be seen that when the shaft 41 is rotated by the pulley 46 it will, through' the pinion 48 and gears 49,' rotate the shafts 50 and the crank discs 52 thereon, and the rotary .motion of these discs rwill, by means of the connecting rods 54, be converted into reciprocatory'motion of the upper and .lower wheel carriages 9V and 10 upon the guldes 4 -and 5.

The motion of the wheel carriages may be such that they both swing toward the same side of the machine simultaneously, as shown in the drawings, or it may be such that the wheel carriages move in opposite directions and perform the grinding at points on the roller which are approximately diametrlcally opposite. The change from one motion to the other can be accomplished by resetting one of the gears 49 and its associated crank discs 52 so that the crank pins 53 on said discs; are turned through 180 degrees. No

' specifcfdifference in the operation of the machine or the mode 'of grinding will result. from change, although it may be c011- the v i sidered preferable to let the `grinding wheels swing to the same side of the machine simul- 'taneously as this may result in a more satisfactory guiding of the roller between its supporting plates, which will be later described.

In Figures 1 and 2 the roller being ground is marked A and is of the form already described with reference to Figure 4.V It will be understood that the rollers to be groundI by the present machine have their plane sides previously ground so that the rollersy will have the desired widthv before being placed in the machine, as no grinding of the plane sides takes place in this machine.

The rollers are guided and'held in proper position during the grinding operation by means of. plates 56 having .inwardly projecting portions 57 between which the rollers pass. rlhe plates 56 are mounted upon rods 85 58 'which are mounted and secured at their outer ends in apertures in flanges59 carried by the webs 2, four of these rods 58 being employed as clearly shown in Figure 2.

n As previously stated, the present machine 1s arranged for adjustment soy that it may operate upon rollers of different widths and for the purpose of such adjustment the central portions of the rods 58 are screw-threadednuts 60 being arranged on the screwthreaded portions at the outer' sides of the plates 56 and spacing sleeves 61 are arranged on the rods between the plat-es 56. By lecting spacing sleeves of proper length land mounting the same on the rods 58 between 10o plates 56, and by then tightening the nuts 60 to hold the plates 56 against the ends of the sleeves, the adjacent surfaces of the parts 57 of the plates will be held at the proper distance apart to form guides for los holding the roller properly in place while being ground and allowing the roller to pass between them without any unnecessary play.

If desired, water, air, oil or othercooling medium may be introduced between the inlm ner surfaces of the parts 57 and the flat sides of the .rollers to serve the double purpose of cooling the rollers and preventing grinding dust from enterlng between the said surfaces, thereby insuring that no grinding 115 shall take place on the flat sides of thel rollers. This cooling medium may be in- 'troduced through a hose or the like conrollersin the magazine into the space between the' pats 57 Qf the plates 56 in proper 3i position to be ground. The innerwall 66 `Figure 4, the arcs a-b, @L4-b', are struck from centers c and c respectively, and in ,order that during the grinding operation vthe grinding wheels shall grind the peripheral surface of the roller in conformitywith these arcs-it is necessary that the grinding wheel carriages 9 and 10 shall move in arcuate paths struck from the said centers c and c. Therefore the curved surfaces of the guide members 4 and 5 are concentric with the center c and c" respectively, and since the grinding wheel carriages are constrained.

to move upon the said curved surfaces ot the guide members it follows that the grinding wheels will move in arcuate vpaths about the centi-pers c and c', and the peripheral surface of the rollers will be ground so that it will conform to asurface of revolution generated loy'the rotation'of the circular arc a-Z), asin Figure 4. i

It has been stated above that the distance C between the centers of curvature c and c varies with differentv sizes or diameters `of rollers and provision is made for adjustment of the machine to enable the grinding wheels to operate upon rollers having different distances between the centers ot'A curvature. This adjustment is elected in the machine being described by means of spacers or plates 69 inserted between the webs 2 and the flanges 7 of the guides 4 and 5 respectively. The greatest distance `between the centers of .curvature will naturally be ob- 'tained if the spacers are entirely omitted and the flanges 7 bear directly against the webs 2 and the distance, may be gradually lessened `by'inserting spacers 69 of gradually increasi ing thickness between the webs 2 and flanges 7 In this way the' distance between the centers of curvature may be gradually diminished downto zero or it may even be v made negative. Whenfthe distance is reduced to zero the centers of curvature will,

of course, coincide with the axis d, e and the peripheral surface of the roller will, be spherical. v0 Q The thickness of the spacers required to correspond with a particular distance G bctween the centers of curvature is determined by subtracting'irom the radius R, Figure 1` -the distance J, one-half of the distance Z and one-half ofL the distance C between the centers of curvature. The distance R, minus J, minus one-half `Z is a predeter- V,mined and known quantity for any particular machine.

To insert. or remove the spacers the huts on the four bolts 6 arey loosened and the upper guide 4 is raised by means of the screws 70 threaded into the flangesl7 of said guide and bearing against the upper surfaces of the Webs 2, the lower guide being lowered by loosening the screws 71 threaded 1n the webs 2'and having their heads engaging the lower surfaces of the flanges 7 of the lower guide. The bolts 6 are retained in place to serve as guides during this operation. Spacers of the desired thickness are then inserted between the webs 2 and the flanges 7 afer which the screws 70 and71 and the bolts 6 are adjusted to bring the flanges 7 into-engagement with the spacers and to clamp the' -ovcr a driving pulley 74 and an idler pulley 75. The pulley 74 is mounted on. a shaft 76`supported in bearings 77 on the machine frame l, and secured to one end of this shaft.

eov

is a pulley 78 driven by a belt 79 from a suitable overhead countershaft.

The idler pulley is mounted on a shaft 80 mounted in bearings 81 which are self aligning so as to permit the angular positions of the idler shaft 80 resulting from the arcuate movement of the grinding wheel Y carriages and the different directions of the pull in thedriving belt 73. The bearings 8l are also mounted for-movement toward or from the axis of the pulleys 25 by means of projecting stems 82r guided in bear-ings 83 supported from the machine framework 1 coil springs 84 being arranged on the outer stems 82 between the outer bearings 83 and nuts 85 on said stems, which springs serve to maintain the proper tension in the driving belt 73.

It will be noted that the belt .7 3 drives lthe pulleys 25 and thereby the grinding wheels 23 in opposite directions, whereby during the grinding operation the roller being ground is rotated by the engagement of the grinding wheels therewith. about its own axis. By this arrangement boh 'grinding wheelscontribute to keep the roller spinlon ning while it is being 'ground and as the two wheels .are turning 1n opposite directions there will be no tendency to either wedge the roller in between the wheels or to throw it out, the force ofholdingv the rollerl between the wheels Jsimply depending upon the amount of -pressure exerted upon the roller u being ground by the weight of the remaining rollers 7in the magazine.

When the roller has been ground to theV desired diameter it will beY automatically removed from between the grindin wheels l in-,glpart bythe action of gravity an in part to let a roller of' the-.proper dimensions pass .stead of passing through the san `through.` If the grinding wheels Ashould have become worn so that theroller-released from' between the same is slightly too large it will bestopped by the gauge lplate 87 inand the operator noticing this will adjust t ie grinding wheels toward each other a suieient disstance to compensate for the wear which has occurred. This is eti'ected by 'means of the pawls 34 previously mentioned which are set by the operator into the operative positions indicated in dotted lines in Figure l, so that at the next outward swing of the wheel carriages 9-10, the pawls will engage and advance the ratchets 34 which, throughv the screws 32 and nuts 3(), will advance the supporting members 17vcarryi'ng the grinding wheel shafts 22. This feeding mechanism 1s preferably put into operation to feed the ratchets 34 one toothy at a time until it is seen that the ,rollers released from between the grinding wheels will pass through the gauge plate 87, the operation of the lmachine then continuing until the ,grinding wheels again become worn. The roller or rollers sopped by the gauge plate are placed again in the magazine to be again ground in their turn.

Those rollers which pass 'through the gauge plate 87 are received by a pan or rc` ceptacle 8S from which they may-be removed by the operator when a' sufficient number has y accumulated. The pan or receptacle 88 inay be supported in any suitable manner from the framework orp the machine and it preterahly supports theA gaugeplate 87 andthe guide member 86. A

y It will .be understood from the detailed description of the machine given above that in the operation of the machine a vnumber ot' rollers are placed in the magazine 64 and the lforemost' roller will be moved by 4gravity and the pressure of the remaining 'rollers into a position between the grinding wheels 23,v which wheelsare rotated in opposite directions about their axis and are at the` same time moved in arcuate paths due to themovement of the wheel carriages 9, 10 upon the arcuate guides 4 and 5. `The roller will thus be spun or rotated about its own axis, while being ground by the grinding members and when it has been ground to the predetermined diameterit will`be removed from between the grinding wheels partly by gravity and partly by the pressure of the remaining "rollers, the next following roller taking its place. The ground roller thus released will pass through the gauge member 87 into the receiving pan 88. A

The machine provides three essential adjustments in conformity with the three determining dimensions ofthe roller, as above mentioned, that is, the grinding wheels may be adjusted toward'or from each other by means ofthe nuts 30 on the stems 17 to deter'- mine the diameter to which the roller is to be ground. Secondly, plates 56 are capable of adjustment toward-or from each other by means of thespacing sleeves 61 and nutsl 60 Ain accordance with the width of the rollers to the ground, the parts 57 of the plates being spaceda" distance apart substantially equal to the width of the rollers to form a guidn ing means or passage 'for the rollers between the grinding wheels. Thirdly, the arcuate guides el and 5 are adjustable by means of the different sized spacers 469 in accordance with the distance C between the centers of curvature c and cv of the roller. In addil tion a line adjustment of the grinding wheels toward or away from each other is provided by mea`ns Aof the ratchets 34.- and pawls 34', this adjustment being chieliy for the purpoe of compensating for wear of the grinding wheels. y In ysome cases only one of the wheels 23 may be a' grinding wheel,

the other being a plane wheel or rotatingI element which has substantially the same function, excepting thatit does not assist in I the grinding operation.

It is to be understood that this machine can be used for several different operations` These different wheels have all been referred to as grinding wheels in the specifications, even those performing the polishing operations.

Itwill be understood that suitable guard devices may be provided adjacent the various belts and gears and particularly adjacent the lower run ofthe belt 73 so as to prevent water or oily delivered through the passages 62 of the plates 56 from falling onto this belt. The upper part of the lower carriage 10. may be suitably shaped as indicated at 89 to receive this liquid, which is conducted therefrom by pipes 90 to the lower part of the framework 1 which is suitably shaped to receive it and from which it mayl be drained through an outlet 91.

It is to be clearly understood that while to enable the construction and operation of the machine tobe clearly understood, it has been described in some detail, the invention is not restricted to the particular details'of construction and operation therein set v`forth, as these may be modified to-su1t different requirements.

What I claim and desire to secure by Let? ters Patent is 1. The method of grinding rollers, which consists in introducing a roller in a direction transverse to the axis thereof between two peripheral surfaces, at least one of which is a grinding surface, rotating said surfaces in opposite directions at the grinding point at substantially the same peripheral speed, whereby said roller is rotated about its axis in engagement with said surfaces and is automatically discharged from between said surfaces wlienreduced to a predetermined diameter.

2. The method of grinding rollers, which consists in introducin a roller into a passage ofsubstantially t e same width as the roller between two peripheral" surfaces, at

through said passage into position between two peripheral surfaces, at least one ofwhich is a grinding surface, rotating said peripheral surfaces in opposite directions at the grinding point at substantially the same peripheral speed, whereby said roller is rotated about its aids between said surfaces and is automatically discharged by gravity from between saidl surfaces when reduced"l Vto a predetermined diameter.

4. The method of grinding rollers, which consists in introducing the roller in a direction transverse to 'the axis thereof into osition between two peripheral surfaces, at east one of which is a grinding surface, rotating said surfaces in opposite directions at the grindin point at substantially the same periphera speed, whereby said roller -is rotated about its axis iii-engagement with said surfaces, and introducing an additional roller or rollers in en agement with the first roller, whereby the rstv roller will be discharged from between lsaid surfaces by the ressure `of the succeedin rollers when reueedto a predetermine diameter.

5. The method of grinding rollers, which consists in' introducing a roller between two v peripheral surfaces, at least one of which is a grinding surface, 'rotating said peripheral surfaces in op osite directions at the grinding point at su stantially the same peripheral speed, whereby said roller is rotated about its axis -in en agement with said surfaces, and moving said surfaces back and forth in arc-shaped paths transversely to the plane of -rotation of said roller. 6. The method of grinding rollers, which t consists in introducing a roller between two peripheral surfaces, at least one of whichI is a grinding surface, rotating said' surfaces in opposite directions at the grinding point` at substantially the same peripheral speed, whereby said roller .is rotated about its axis in enga ement with said surfaces, and moving at east one'ofv said surfaces back and forth in an arc-shaped path transversely to the plane of rotation of saidroller.

7. Armachine for grinding rollers, comprising in combination, two rotating elements, at least one of which is a grinding element, means for supporting .said elements with their axes in acommonV plane, means for rotating said elements in opposite directions at the grinding point at substantially the same peripheral speed, means for automatically introducing rollers in succession into the space between the peripheral faces of said rotating elements in a direc tion transverse to said common 'plane and .with the axes of the rollers parallel to said plane, and means for guiding the rollers during their passage between said peripheral surfaces b engagement with the side faces of the ro 1ers.

8. A machine for grinding rollers, comprising ,in combination, two rotating ele?. ments, at least one of which is agrinding element, means'for supporting said elements with the axes thereof in a common plane, means for rotatin said elements in 'opposite directions at ti ico e grindin point at substantially the same periphera speed, a mag-v azine constructed yto hold a series of rollers with their axes parallel to said common plane, said magazine lying in 4a plane transverse to saidcommon ranged to position the oiemost roller of the l.series in the space between, the peripheral surfaces of said elements, and means engaging the opposite side faces of said roller to hold the same. in 'position while being ground between said surfaces.

9. A machine for grinding rollers and the like, comprising in combination', two rotating elements, at least one of which is a grinding element, means for supporting and ro-v io lane, and being arlll tating said elements to move in opposite' directions at the grindingpoint, means" for giving said elements areciprocating motion in a plane including the axes of said elements, means for introducing a roller between` the adjacent surfaces of said elements, in ai direction transverse to said plane, and means for holding said roller in place between said elements during the grinding operation by engagement with the side faces of said roller.

10.` A machine for4 grindingrollers and the like, comprising in combination, tworotating elements, at least one of which is a grinding element, means for supporting and\ro tating saidelements tomove in opposite directions at the grinding point, means 'for introducing a roller between the adjacent surfaces of said elements, and holding means engaging opposite surfaces of said roller during the grinding operation and formed to conduct Huid to said surfaces of said roller. o

11. A machine for grinding rollers and the like,cQmprising in combination, two rotating elements, atleast one of which isa grinding element, means for supporting and rotating said elemennts to move in opposite directions at the grinding point, means for introducin a rol er between the adjacent surfaces o said elements, guide members positioned to engage the opposite side faces of said roller, a plurality of rods on which said guide members are supported, spacers on said rods between said guide members and nuts threaded on said rods and-clamping said members againstsaid spacers.

12. A machine for grinding .rollers and the like, comprising in combination, a rotatable grinding element, means for supporting a roller, without centering same, with its axis in substantially`the same lplane as the axis of the grinding element, and with its peripheral surface in operative grinding relation to the peripheral surface of said element, means for supporting and rotating said element, and means for continuously reciprocating said element and its supporting means Ibodily in val1-arcuate path in a plane transverse to the plane of rotation'of Said element.

13. A machine for grindingx rollers and the like, comprising in combination, a pair of oppositely rotating elements, at least one of w ich is a. grinding element, meansfor positioning a roller between the adjacent peripheral surfaces of said elements, means for supporting said elements with their axes in a common plane, means for rotating said Aelements to move. in opposite directions at Grinding point, and means for continuously reciprocating said elements in arcuate paths in said common plane.

14. A machine for grinding rollers and the like, comprising in combinatiom a pair of lrotatable elements, at least one of which is a grinding element, means for supporting said elements, means for rotating said elements to move in opposite directions "atthe grinding point, means for positioning a roller between the adjacent peripheral' surfaces of said elements, and means for moving said elements' in arcuate Ipaths in a common pllane transverse to the planes of rotation of said elements each about a center of curvature lying in the median plane of said roller.

15. machine for grinding` rollers and the like,comprising in combination, a rotatable grinding element, means for rotatingl said element, means for supporting a roller in guide. means lying in a plane transverse tol the planeof rotation of said element and supportin means for said element reciprocable on sai guide means during the grinding 0p` eration.

16. A machine for grinding rollers and the like, comprising in combination, a rotatable grinding element, means for rotating said element, means for supporting 'a roller lin operative grinding relation to said element,

and arcuate guide means having a. definite center of curvature, said guide means lying in a plane transverse to the plane of rotation 4of said element, supporting means for said element reciprocable on said guide means during the grinding operation, and means for adjusting the position of 'said guide means to vary theposition of the center of curvature thereof. 17. A inachinefor grinding rollers and the.

like, comprising in combination, a rotatable grinding element, means for rotating said element, means for supporting a roller in operative grinding relation tosaid element, and arcuate guide means having a definite center of curvature, said guide means lying in a plane transverse to theplane of rotation of said element, supporting means for said element reciprocable on said 'guide means during the grinding operation, meansV supporting said arcuate guide means, and,

spacing members of differentv thicknesses insertable between said guide :means and itsV supporting 4means to vary't-heposition ot the center of curvature of said guide means.

18. A machine for grindingrollers and the like, comprising in combination, a pair ot rotatable elements, atleast one of which elements is a grinding element, means for; rotatlng saidelemeiits to move 'in opposite directions at the grinding poing/means for introducing a rollerl between vthe peripheral surfaces yof said elements, arcuate guide members having definite centers of curvature, supporting means for said guide means, supporting means for said rotating elements mounted on said arcuate guide members, means for reciprocating said elementsupporting means onsaid guide members, and

means for ,adjusting saidguide members toward or from each other to vary the relit) iis

lationship between the centers of curvature.

thereof.

19. A. machine for grindingrollers'and' the like, comprising in combination, a pair of rotatable elements,'at least one of which. elements is a ,grinding element, means for rotating said elements to move in opposite directions at the'grinding point, means for introducing Va rollerbetween the peripheral surfaces of said elements,y arcuate guide members having definite centers of curvature, supporting means for said guide means, supporting means for said rotating elements mounted on said arcuate guide members, means for reciprocatingsaid element sup porting means on said guide members and spacing members of different thicknesses inseitable between said guide members to space the same apart different distances.

20. A machine for `grinding rollers and the like, comprising in combination, two rotating clen'icnts, aty least one of which is a grinding clement, means for supporting and rotating said elements to move in opposite directions at the grinding point, means for giving the rotating elements a reciprocating motion, means for introducing a roller between the adjacent peripheral surfaces of said elements, means for holding said roller in place between said elements during the grinding operation by engagement with the opposite side faces ot' said roller, and means for adjusting said rotating elements toward or from each other to grind rollers of dif- 'crent diameters.

2l. A machine for grinding rollers and the like comprising in combination, two 1'0- tatinrr elements, at least one of which is a grinding element, wheel shafts carrying said elements, inembers supporting each of said shafts, wheel carriages, each slidably sup` portin the supporting members of one of said w ieel shafts, means for supporting said 1 wheel carriages, and vmeans for ,slidably adjusting said supporting members relatively to the respective wheel carriages. means for rotating said elements toy move in opposite directions at the grinding pointA means for introducing the roller between the adjacent peripheral surfaces of said elements, and means for holding saidroller in place between said elements during the grinding operation.

22. A machine for grinding rollersand the like, comprising in combination, two rotatin elements, at least one of which is a grin( ing clement, means for supporting and rotating said elements to move in opposite directions at the grinding point, means for introducing a roller bet-Ween the adjacent peripheral surfaces of said elements, 'means for holding said roller in lace between said elements during the grin ing operation 4by engagement with the opposite side faces ofsaid roller, and means adapted fto'be positioned' to effect automatic adjust-ment of said Irotating elements relatively to each vother during the grinding operation.

y'23. A machine for grinding rollers and the like, comprising in combination, a rotatai ble grinding element,pmeans for supporting a' roller in .operative inding relation to said element, means or support-ing and rotating said element, means for moving supporting means during the grinding oper;

ation.

24. A machine for grinding rollers an `the, like, comprising in combination, a rotatable grinding element, means for supporting a roller 1n operative grinding relation to said element, means for supporting and rotating said element, means for moving said element in an arcuate path in a plane transverse to the plane of rot tion of said element, and means adapted toQbe manually positioned and to thereafter automatically operate during the arcuate movement of said element vto adjust the position of said ele-- ment relatively to .the roller supporting means,

25. A machine for grinding rollers and the like, comprising in combination, a pair of oppositely rotating elements, at least one of-which is a grinding element, means for positioning a. roller between the adjacent surfaces of said element, means for supporting said elements, means for rotating sai-d elements to move in opposite directions at the grinding point, means -for moving said elements in arcuate paths in a plane trans-l verse to the planes of rotation of said elements, and means adapted to be positioned for automatic operation by the arcuate movement of ,said elements to adjust the saine relatively to each other.

26. A machine for grinding rollers and the like, comprising in combination, two rotating elements, at least one of which is a grinding element, means -for supporting and rotating saidv elements in opposite directions at the grinding point and with .their axes in the same vertical plane, 4'means for passing a roller into andthrough the space between the peripheral surfaces of said elements with its axis parallel to said plane, and means for moving at least one of said elements in an arc shaped path in a plane perpendicular to the plane of rotation and including the axes of said. elements about a center within the roller.

21A machine for grindingv rollers and the like, comprising in combination, two rotatin elements, at least one of which is a. grin ing element, means for supporting said elements for rotation in substantially the same vertical plane about parallel vertically spaced apart axes, means for rotating .said elements so that the adjacentportions said element supporting means including receiving rollers automatically discharged means for guiding said elements in arc from between the peripheral surfaces of said shaped paths in a plane perpendicular vto elements. y the plane of rotation of said elements and In testimony whereofl aiix my signature. including the axes of said elements, means Y i f M for eil'ecting movement of said elements ELOV F. MAAS. along said arc shaped paths, and ymeans for 

